December 2020
Intermediate to advanced
270 pages
6h 20m
English
This chapter is one of the larger and more challenging ones but getting hold of the classic and foundational principles here is vital for a safe understanding and application of quality thinking.
A main criterion of quality is consistent delivery to the requirements. Variation is the enemy of consistency. A consistent measurement outcome always yields the same result. A measure of consistency is the scatter or dispersion of results around some, assumed, true value. Perfect consistency can be represented by a single value on a chart, variation by a bell-shaped curve around the average or central value. If we weigh 10 screws on a balance, we expect to get the same result ...
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